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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd549ca70153947f3c44e633819a69cbf23b8bf8ce0fa7a8332c5ba203a76d53a' 
  AND token = 'Cw4Z36IyJddvPc6lYVmYqznM9j9424IrkcU5N1pjBsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}